Memory Scrub Process For Flash Memory On Blackberry Devices; Memory Scrub Process For Flash Memory That Stores User-Saved Files On Blackberry Devices - Blackberry ENTERPRISE SOLUTION SECURITY - ENTERPRISE SOLUTION - SECURITY TECHNICAL Overview

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Memory scrub process for flash memory on BlackBerry devices

Memory scrub process for flash memory on BlackBerry devices running BlackBerry Device Software versions
earlier than 4.6
If content protection is turned on, to overwrite the BlackBerry device NOR flash memory during a BlackBerry
device wipe by changing the state of each bit four times, the BlackBerry device memory scrub process performs
the following actions:
1. Writes 0x33 to each byte (0011 0011
2. Clears all bytes to 0xFF to each byte (1111 1111
3. Writes 0xCC to each byte (0x1100 1100
4. Clears all bytes to 0xFF (1111 1111
5. Writes 0x55 to each byte (0x0101 0101
6. Clears all bytes to 0xFF (1111 1111
7. Writes 0xAA to each byte (0x1010 1010
8. Clears all bytes to 0xFF (1111 1111
Memory scrub process for flash memory on BlackBerry devices running BlackBerry Device Software version
4.6 and later
If content protection is turned on, to overwrite the BlackBerry device NAND flash memory during a BlackBerry
device wipe by writing a single character before clearing the data, the BlackBerry device memory scrub process
performs the following actions:
1. Writes or programs 0x00 to each byte (0000 0000
2. Clears all blocks, setting all bytes to 0xFF (1111 1111

Memory scrub process for flash memory that stores user-saved files on BlackBerry devices

If content protection is turned on and the BlackBerry device supports a partition of flash memory to store user-
saved files using an internal memory card file system, to overwrite that section of the BlackBerry device memory
during a BlackBerry device wipe by writing a single character before clearing the data, the BlackBerry device
memory scrub process performs the following actions:
1. Writes or programs 0x55 to each byte (0101 0101
2. Writes or programs 0xAA to each byte (1010 1010
3. Clears all blocks, setting all bytes to 0xFF (1111 1111
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